Tire Size Box

305/60R19 vs 305/65R19

305/65R19 compared with 305/60R19

+3.6% diameter, 0.0" width

305/65R19 is 34.61" tall vs 33.41". More than the 3% rule of thumb, so check carefully before switching.

33.4"19" rim7.2"12.0" wide
305/60R19 (solid) compared with 305/65R19 (dashed outline), drawn to scale

With 305/65R19 tires, when your speedometer says 60 mph you are really going

62.2 mph

305/65R19 is +1.20 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

305/60R19305/65R19Difference%
Overall diameter33.41"34.61"+1.20"+3.6%
Section width12.01"12.01"0.00"0.0%
Sidewall height7.20"7.81"+0.60"+8.3%
Circumference104.96"108.73"+3.77"+3.6%
Revolutions per mile603.7582.7−20.9−3.5%

Speedometer difference

If your vehicle came with 305/60R19 and you fit 305/65R19, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 305/60R19 or 305/65R19?
305/65R19 is taller by 1.20 inches (34.61" vs 33.41"). 305/60R19 is the same width.
Can I replace 305/60R19 with 305/65R19?
It is not recommended without checking carefully. The diameter difference is +3.6%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 305/65R19 change my speedometer?
When your speedometer reads 60 mph with 305/65R19 fitted (calibrated for 305/60R19), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.6%.
Will 305/65R19 lift my vehicle?
Ride height changes by half the diameter difference: +0.60 inches of ground clearance at the axle.

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